Abstract
The optical image encryption has attracted more and more researchers’ attention, and the various encryption schemes have been proposed. In existing optical cryptosystem, the phase functions or images are usually used as the encryption keys, and it is difficult that the traditional public-key algorithm (such as RSA, ECC, etc.) is used to complete large numerical key transfer. In this paper, we propose a key distribution scheme based on the phase retrieval algorithm and the RSA public-key algorithm, which solves the problem for the key distribution in optical image encryption system. Furthermore, we also propose a novel image encryption system based on the key distribution principle. In the system, the different keys can be used in every encryption process, which greatly improves the security of the system.
Highlights
The characteristics of optical information processing are parallel and multidimensional, so more and more researchers have been studying the optical information security in the recent twenty years
Optical image encryption system based on double random phase encoding (DRPE) was proposed in 1995 [1] and the keys were two random phase matrices in this system
Zhang et al proposed an optical cryptosystem based on the phase-truncated Fresnel diffraction (PTFD) and transport of intensity equation (TIE) [26]
Summary
The characteristics of optical information processing are parallel and multidimensional, so more and more researchers have been studying the optical information security in the recent twenty years. Optical image encryption system based on double random phase encoding (DRPE) was proposed in 1995 [1] and the keys were two random phase matrices in this system. It was easy for the optical implementation and easy to combine with other encryption methods, so it attracted many researchers’ attention and a lot of improved encryption systems were proposed in [2,3,4,5,6,7]. We propose an image encryption system of changing key based on the key distribution principle which conforms to the basic protocol of ACS, and the greatest advantage of the system is that both sides of communication can change key constantly, which greatly improve the security of the system
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